Black Brook is an 11.4-mile-long (18.3 km)^[1] stream located in southern New Hampshire in the United States. It is a tributary of the Merrimack River, which flows to the Gulf of Maine.

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Black Brook
Black Brook at site of former dam in Manchester, NH (2011)
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Location
Country	United States
State	New Hampshire
Counties	Merrimack, Hillsborough
Municipalities	Dunbarton, Goffstown, Manchester
Physical characteristics
Source	Kimball Pond
• location	Dunbarton
• coordinates	43°4′54″N 71°34′31″W
• elevation	494 ft (151 m)
Mouth	Merrimack River
• location	Manchester
• coordinates	43°0′34″N 71°28′31″W
• elevation	175 ft (53 m)
Length	11.4 mi (18.3 km)

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Black Brook begins at the outlet of Kimball Pond in Dunbarton, New Hampshire. The brook travels southeast into Goffstown and then Manchester, joining the Merrimack just upstream from Amoskeag Falls.

• List of rivers of New Hampshire